Add a "Overdue, Today and Starred" option to the application badge setting.

The reason for this is that sometimes I will simply star an item that I want to do today that has no due date. This would show on the app badge if I change the settings to reflect this but then the app badge wouldn't also show my items that have a due date of today.

Maybe I have nothing due today, have a look through my tasks and Star an item for later. It would then just show up on the app badge without me changing any settings.